Exploring B_{d,s}-> KK decays through flavour symmetries and QCD-factorisation

Details Exploring B_{d,s}-> KK decays through flavour symmetries and QCD-factorisation Exploring B_{d,s}-> KK decays through flavour symmetries and QCD-factorisation

2006-03-29

arxiv.org/abs/hep-ph/0603239v2

Phys.Rev.Lett. 97 (2006) 061801

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures. Enlarged discussion on 1/mb contributions

Scientific paper

10.1103/PhysRevLett.97.061801

We present a new analysis of B_{d,s}->KK modes within the SM, relating them in a controlled way through SU(3)-flavour symmetry and QCD-improved factorisation. We propose a set of sum rules for B_{d,s}-> K^0{\bar K}^0 observables. We determine B_s-> KK branching ratios and CP-asymmetries as functions of A_{dir}(B_d-> K^0{\bar K}^0), pointing out a conflict between BR(B_s-> K+K-) in the SM and data. Finally, we predict the amount of U-spin breaking between B_d-> pi+pi- and B_s-> K+K-.

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